I cannot believe you did that! Expresses horror as well as fear, worry and mistrust. In response to a negative surprise. Got caught red-handed and just feels totally taken by surprise.
The frowning face with open mouth emoji was introduced in 2012 and released as part of the Unicode 11.0 standard. This emoji can be found under the smileys and emotions
category. Because the frowning face with open mouth emoji has been around for quite some time, it should display correctly in the majority of operating systems.